Die construction.



G. TANZI.

DIE CONSTRUCTION. \APPLICATION FILED SEPT. 10, 191

Pafrented June 18, 1918.

GUIIDO TANZI, OF ST. LOUIS, MISSOURI, ASSIGNDR T0 GINEVBA MACARONI MOLD COMPANY, 015 ST. LOUIS, MISSOURI, A CORPORATION.

THE CONSTRUCTION.

Specification of Letters Patent.

Patented June 18, 1129016..

Application filed September 10, 1917. Serial No. 190,510.

To all whom it may concern:

Be it known that I, Guroo TANzI, a subject of the King of Italy, and resident of St. Louis, State of Missouri, have invented certain new and useful Improvements in Die Construction, of which the following is a specification.

This invention relates to dies adapted to the manufacture of tubular products, such as macaroni, and has for its objects certain improvements in my earlier invention, as disclosed in Patent No. 1,228,495, granted June 5, 1917. Such improvements consist in the provision of a cheaper construction and one adapted to the manufacture of small sizes of macaroni and also thinner walled tubes.

The present invention is illustrated in the accompanying drawings, of which:

Figure 1 is an edge view ofa die plate, a portion being shown as a section on line 11 of Fig. 2;

Fig. 2 is a bottom plan view of the die plate illustrated in Fig. 1;

Fig. 3, 4: and 5 are, respectively, top plan, side elevation, and bottom plan of one of the inserts, appearing in Figs. 1 and 2, in an intermediate stage of its manufacture;

Fig. 6 is a section on line 6-6 of Fig. 3, and

Figs. 7 8 and 9 are, respectively, top plan, side elevation and bottom plan of a completed insert,

Referring to the drawings, 10 indicates a die-plate, which may be of steel or other suitable material and which is provided with a system of conical holes 11, in each of which there is an insert 12, which may be made of copper or bronze or other material in accordance with the usual practice.

Each of the inserts 12 has a conical exterior, to fit the openings 11, and a passage formed by a plurality of longitudinal openings 13 extending into the insert from one end and communicating with an annular opening 14.111 the opposite end. This is most clearly illustrated in Fig. 6. I prefer to provide each insert with three of the openings 13, and to have the mouth of each of these openings reamed, as'indicated at 15, to facilitate the passage of the material, to be worked, thereinto.

The inserts 12 may be made from a cylindrical rod, out into proper lengths, as indicated in Fig. 4c, and each length having three holes 13 drilled into one end, as indicated in Fig. 3, and an annular opening 14 at the opposite end, as indicated in Fig. 5. The annular opening 1% forms the mandrel 16 which is carried by the bridge 17, between the holes 13. From Fig. 5 it will be seen that the width of the opening 14: permits the use of a comparatively rigid and substantial end-milling tool to form this opening. After the openings 13 and 1 1 have been formed, the piece is put into a press and by means of suitably shaped dies, the construction of which will be perfectly obvious to those skilled in the art of die-making, the outer wall, surrounding the opening 14:, is closed" in to provide a conical exterior, as shown most clearly in Figs. 1 and 8. In Fig. 9 is shown the discharge end and it will be observed that the annular space surrounding the mandrel 16 is greatly reduced from the size in Fig. 5, so that tubes having thin walls may be made. The width of the said annular opening may, of course, be varied by regulating the amount which the side walls are closed in, as above described, and accuracy in this particular may be had by means of a tubular mandrel having a cross section like the product to be made by the die, arranged on the mandrel 16, and closing the outer walls in against this tubular mandrel. This will also provide for having parallel sides for the annular opening 16, as shown at 18 in Fig. 1. The advantage in these parallel sides is that the discharge portion of the annular passage is of uniform width for some distance and, on this account, not only produces a better product but is more durable and will hold its size for a greater period of use. A die made as above described, is inexpensive as compared with a solid copper or bronze die made in accordance with my Patent #1,228,495, or by any of the methods of construction heretofore used, due to the saving in copper through the use of inserts and the manufacture of the inserts by special machinery. Moreover, when the inserts are worn they may be replaced by new ones without resorting to a new plate 10. The inserts may also be changed to make different sizes of product and the tapering passage provided in the insert allows the material to flow without undue friction, although producing the desired density in the product.

While I have illustrated and described a preferred form of the invention, I do not do sire to be limited to the exact details, except as described in the appended claims.

Having thus described my invention, What I claim is 1. A tube-forming die consisting of a coni cal member having an outer Wall of substantially uniform thickness and an end Wall on the entrance side, said end Wall being provided with a plurality of openings therethrough Which communicate With a tapering hole extending to the discharge side of the die, and a mandrel centrally arranged in said hole and carried by said end Wall.

2. The method of making a tubeforming die Which consists in drilling a plurality of holes from the entrance side of the die, and

a hole from the discharge side into communi cation with said plurality of holes, and then closing in the outer wall to form a conical periphery and reduce the diameter of said hole.

3. The method of making a tube-forming die which consists in drilling a plurality of holes from the entrance side of the die and I GUIDO TANZI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

